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<p>Natural fibers such as straw fibers are often used as additive materials to improve soil strength in engineering, so the study of the relationship between the fiber content and compaction effort of straw fiber reinforced soils as well as the reinforcement mechanism is crucial in engineering practice. This study investigates the effects of rice straw fiber content and the compaction effort on the macro - micro characteristics of silty sand through laboratory tests, controlling for two variables: dry density and compaction effort. Utilizing microscopic research methods such as SEM images and NMR, the study reveals the pore distribution characteristics at the fiber-soil interface under different numbers of compaction effort. It verifies the strengthening effect of compaction treatment on the fiber-soil interface and discusses the reinforcement mechanism of straw fiber-reinforced soil. The results indicate that: The Unconfined Compressive Strength (UCS) initially increases and then decreases with increasing fiber content, demonstrating an optimal fiber dosage for reinforcement. The influence of the number of compaction blows on UCS follows a parabolic trend: excessive compaction blows lead to a reduction in strength due to localized tensile cracking within the soil. Dry density exhibits a linear negative correlation with fiber content; for every 1% increase in fiber dosage, the dry density decreases by approximately 0.05&#xa0;g/cm³, confirming the lightweight effect of fiber reinforcement in soil. SEM images show that compaction effort promotes the formation of an “interlocking network structure” between fibers and soil particles. As the compaction effort increases, the percentage of large pores decreases and the percentage of tiny pores (&lt; 0.15&#xa0;μm) increases dramatically. The compaction treatment converted medium pores (1.5 ~ 4&#xa0;μm) into tiny pores by compression, resulting in a more uniform pore distribution. The porosity was stabilized at 22.577%~23.896%, and the pore size distribution was optimized significantly. Increasing fiber content alters the soil failure mode to plastic bulging, with cracks exhibiting dispersed distribution. The findings of this study can provide a theoretical basis and technical guidance for the application of rice straw fiber reinforced soil in foundation treatment and slope protection engineering.</p>

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Effect of Compaction on Macro-micro Behavior of Rice Straw Fiber Reinforced Soil

  • 期刊论文

  • 发表日期：

    2025年12月27日

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  • Zhibo Chen,
  • Haoyu Fu,
  • Xuewen Guo,
  • Hanjiang Lai,
  • Yongning Xie,
  • Wei Huang

摘要

Natural fibers such as straw fibers are often used as additive materials to improve soil strength in engineering, so the study of the relationship between the fiber content and compaction effort of straw fiber reinforced soils as well as the reinforcement mechanism is crucial in engineering practice. This study investigates the effects of rice straw fiber content and the compaction effort on the macro - micro characteristics of silty sand through laboratory tests, controlling for two variables: dry density and compaction effort. Utilizing microscopic research methods such as SEM images and NMR, the study reveals the pore distribution characteristics at the fiber-soil interface under different numbers of compaction effort. It verifies the strengthening effect of compaction treatment on the fiber-soil interface and discusses the reinforcement mechanism of straw fiber-reinforced soil. The results indicate that: The Unconfined Compressive Strength (UCS) initially increases and then decreases with increasing fiber content, demonstrating an optimal fiber dosage for reinforcement. The influence of the number of compaction blows on UCS follows a parabolic trend: excessive compaction blows lead to a reduction in strength due to localized tensile cracking within the soil. Dry density exhibits a linear negative correlation with fiber content; for every 1% increase in fiber dosage, the dry density decreases by approximately 0.05 g/cm³, confirming the lightweight effect of fiber reinforcement in soil. SEM images show that compaction effort promotes the formation of an “interlocking network structure” between fibers and soil particles. As the compaction effort increases, the percentage of large pores decreases and the percentage of tiny pores (< 0.15 μm) increases dramatically. The compaction treatment converted medium pores (1.5 ~ 4 μm) into tiny pores by compression, resulting in a more uniform pore distribution. The porosity was stabilized at 22.577%~23.896%, and the pore size distribution was optimized significantly. Increasing fiber content alters the soil failure mode to plastic bulging, with cracks exhibiting dispersed distribution. The findings of this study can provide a theoretical basis and technical guidance for the application of rice straw fiber reinforced soil in foundation treatment and slope protection engineering.